Malicious PDF — malware analysis report

Static analysis result for SHA-256 852bd11accf4bec1…

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 19:48:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 23a4c07d79ac04a3db0adef5c6efbcd5 SHA-1: 9df0d3af716ffd687832ade923fa78d167dea69f SHA-256: 852bd11accf4bec12bdffe5c17c6af5619e411f10cb3e3acb44665a4039956b9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links, including one to 'netcdn.tw', which is identified as a malicious redirector. The document body and heuristics suggest a lure for game hacks or free items, aiming to trick users into clicking the malicious link. No scripts were extracted, but the presence of malicious redirectors and the lure indicate a phishing or social engineering attack. The primary IOC is the malicious redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/479516143/minecraft-hack-download-game-hack In PDF document text
    • https://irecruitersafrica.com/ckfinder/userfiles/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://irecruitersafrica.com/ckfinder/userfiles/files/roblox-promo-codes-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://irecruitersafrica.com/ckfinder/userfiles/files/roblox-chat-hacks-grab-knife_GM431946152.pdfIn PDF document text
    • https://irecruitersafrica.com/ckfinder/userfiles/files/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • https://irecruitersafrica.com/ckfinder/userfiles/files/coin-master-hack_GM406889139.pdfIn PDF document text
    • https://irecruitersafrica.com/ckfinder/userfiles/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://irecruitersafrica.com/ckfinder/userfiles/files/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://irecruitersafrica.com/ckfinder/userfiles/files/get-free-robux_GM431946152.pdfIn PDF document text
    • https://irecruitersafrica.com/ckfinder/userfiles/files/roblox-cool-and-free-hat-catalogue_GM431946152.pdfIn PDF document text
    • https://irecruitersafrica.com/ckfinder/userfiles/files/how-to-make-the-animation-free-in-roblox_GM431946152.pdfIn PDF document text
    • https://irecruitersafrica.com/ckfinder/userfiles/files/roblox-hacker-2021-exe-download_GM431946152.pdfIn PDF document text
    • https://irecruitersafrica.com/ckfinder/userfiles/files/best-free-injector-roblox_GM431946152.pdfIn PDF document text
    • https://irecruitersafrica.com/ckfinder/userfiles/files/free-followers-for-roblox_GM431946152.pdfIn PDF document text
    • https://irecruitersafrica.com/ckfinder/userfiles/files/coin-master-strategy_GM406889139.pdfIn PDF document text
    • https://irecruitersafrica.com/ckfinder/userfiles/files/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • https://irecruitersafrica.com/ckfinder/userfiles/files/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • https://irecruitersafrica.com/ckfinder/userfiles/files/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://irecruitersafrica.com/ckfinder/userfiles/files/prisonbreaker-hack-script-roblox-pastebin_GM431946152.pdfIn PDF document text
    • https://irecruitersafrica.com/ckfinder/userfiles/files/promo-code-roblox-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://irecruitersafrica.com/ckfinder/userfiles/files/hack-to-get-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3204 22556 bytes
SHA-256: 064c3f209abd4f51c3901f409a7bf9c2a34bc11ae9427e2c6a5a1e4413549bbc
font_01_sfnt_off00006438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6438 18748 bytes
SHA-256: 7d976cf09cf6847225c0071798e8d9f98538d253ea26ac6bed308074c1f82c66

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